Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Stress Intensity factor Analysis for Three-Dimensional Cracks in Inhomogeneous Materials

비균질재료의 3차원 균열에 대한 응력확대계수 해석

  • 김준수 (경기대학교 기계공학과 대학원) ;
  • 이준성 (경기대학교 기계시스템디자인공학부)
  • Published : 2003.04.01
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Abstract

Accurate stress intensity factor analyses and crack growth rate of surface -cracked components in inhomogeneous materials are needed fur reliable prediction of their fatigue life and fracture strengths. This paper describes an automated stress intensity factor analysis of three-dimensional (3D) cracks in inhomogeneous materials. 3D finite element method (FEM) was used to obtain the stress intensity factor fur subsurface cracks and surface cracks existing in inhomogeneous materials. To examine accuracy and efficiency of the present system, the stress intensity factor for a semi-elliptical surface crack in a plate subjected to uniform tension is calculated, and compared with Raju-Newman's solutions. Then the system is applied to analyze cladding effect of subsurface cracks in inhomogeneous materials. The results were compared with those surface cracks in homogeneous materials. It is clearly demonstrated from these analyses that the stress intensity factors for subsurface cracks are less than those of surface cracks. Also, this system is applied to analyze cladding effect of surface cracks in inhomogeneous materials.

Keywords

References

  1. Raju, I. S. and Newman, J. C., 'Stress Intensity Factors for a Wide Range of Semi-Elliptical Surface Cracks in Finite Thickness Plates,' Engineering Fracture Mechanics, Vol. II, pp. 817-829, 1979 https://doi.org/10.1016/0013-7944(79)90139-5
  2. Chow, C. L. and Lau, K. J., 'On the Finite Element Method for Calculation Stress Intensity Factors with a Modified Elliptical Model,' International Journal of Fracture, Vol. 12, pp. 59-69, 1976 https://doi.org/10.1007/BF00036009
  3. Tracey, D. M., 'Finite Elements for ThrecDimensional Elastic Crack Analysis,' Nuclear Engineering and Design, Vol. 26, pp. 282-290, 1974 https://doi.org/10.1016/0029-5493(74)90063-6
  4. Isida, M., Yoshida, T. and Noguchi, H., 'Tension of Finite- Thickness Plate with a Pair of Semi-Elliptical Surface Cracks,' Engineering Fracture Mechanics, Vol. 35, pp. 961-965,1990 https://doi.org/10.1016/0013-7944(90)90125-Z
  5. Isida, M., Noguchi, H. and Yoshida, T., 'Tension and Bending of Finite-Thickness Plate with a Semi Elliptical Surface Crack,' International Journal of Fracture, Vol. 26, pp. 157-188, 1984 https://doi.org/10.1007/BF01140626
  6. Shah, R. C. and Kobayashi, A. S., 'Stress Intensity Factor for an Elliptical Crack Under Arbitrary Normal Loading,' Engineering Fracture Mechanics, Vol. 3, pp. 71-96, 1971 https://doi.org/10.1016/0013-7944(71)90052-X
  7. Smith, F. W. and Sorensen, D. R., 'The Semi-Elliptical Surface Crack : A Solution by the Alternating Method,' International Journal of Fracture, Vol. 12, pp. 45-57, 1976 https://doi.org/10.1007/BF00036008
  8. Kim, J. S., et. aI., 'Effect of Cladding on Stress Intensity Factors in Reactor Pressure Vessel,' Trans. KSME, Vol. 22, No. 10, pp. 1938-1946, 1998
  9. Newman, J. C and Raju, I. S., 'A Review and Assessment of the Stress Intensity Factors for Surface Crack,' ASTM STP 687, pp. 16-42, 1979 https://doi.org/10.1520/STP35030S
  10. Moaveni, S., 'Finite Element Analysis: Theory and Application with ANSYS,' Pearson Education Korea 2001
  11. Barsoum, R. S., 'Application of Quadratic Isoparametric Finite Elements in Linear Fracture Mechanics,' International Journal of Fracture, Vol. 10,pp. 603-605, 1974 https://doi.org/10.1007/BF00155266